压电驱动狭缝喷口自耦合射流流动特征研究  

Flow Features of Synthetic Jet from Slot Nozzle Actuator Driven by Piezoelectric Membrane

作　　者：谭晓茗[1] 张靖周[1] 

机构地区：[1]南京航空航天大学,南京210016

出　　处：《中国机械工程》2007年第21期2600-2604,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50276028)

摘　　要：采用实验和数值模拟相结合的方法对自耦合射流的流动特性进行了研究。研究结果表明:在紧邻喷口的法向距离内,涡对周期性地生成、破碎和融合,在某个法向距离上形成较为稳定的连续性射流;自耦合射流在发展过程中呈现出在短轴方向急剧扩展,而在长轴方向先向内汇聚、再向外发展的特征;自耦合射流的速度分布与常规射流的速度分布相比,两者在喷口水平方向上均呈现比较规律的速度自模的特征,但在喷口长轴方向,接近喷口的位置速度分布呈现明显的对称马鞍状,随着离喷口法向距离的增加,这种马鞍状的分布逐渐消失。Experimental study and numerical simulation were used to study the flow characteristics of a synthetic jet. The results show that. near the slot exit, pairs of vortexes are generated, broken down and merged together periodically, forming the continue jet at one normal distance near the slot nozzle. And during the development, the synthetic jet spreads rapidly in the short axis direction, this means the weaker strain of the side synthetic jet. Comparing with the constant jet, the velocity profiles of the synthetic jet is self--similar in the short axis direction, While in the long axis direction, the synthetic jet contracts firstly and then spreads slowly. Near the nozzle, the velocity distribution on the slot length is like a saddle while with the distance far away it disappeares

关 键 词：自耦合射流 流动特性 数值模拟 动网格 

分 类 号：O354[理学—流体力学] V231.1[理学—力学]